The 1Ds MkIII is rated to a genuine 1/250 sync speed, as opposed to the hopeful 1/200 of the 5D MkII that often doesn't actually sync anywhere over 1/160 with other radio triggers either. So I doubt it is my camera, but it could be.
I don't believe the 600EX-RT is overpriced, it is $499 at the moment, cheaper than the 580EX was and cheaper than the SB910 is, and neither of them have radio. The cheapest full functioning ETTL compatible radio is around $100 per flash, with other solutions being much more expensive.
Third parties reverse engineering is a double edged sword, if they get too good at it Canon will break the protocols. Now the Phottix Odin system seems like a really interesting buy with a great feature set, but as wiith all third parties, keeping up with Canon's gotcha's will be ever more difficult, and more frustrating for the owners.
I am not a rich guy, but I am very happy to have chosen and invested in the Canon RT system. I am sure doggie will enjoy his new purchase, though I was reluctant to recommend a flash hat cost more than his camera......